Protective casing for electric coils



C April 12, 1932.

C. M. WINKELMAN PROTECTIVE CASI'NG FOR ELECTRIC COILS Filed March 21,1929 Patented Apr. 12, 1932 UNITED STATES PATENT OFFICE CHARLES M.WINKELMAN, OF CHICAGO, ILLINOIS, ASSIGNOR T BELDEN :MANUFACTUR- INGCOMPANY, 0F CHICAGO, ILLINOIS, A CORPCRATION OF ILLINOIS IPRO'IEC'IIVECASING FOR ELECTRIC COILS Application filed March 21, 1929. Serial No.348,752.

f toprovide a protective casing of simple construction which can bemanufactured cheaply and economically; to provide a protective casing ofcomparatively lightweight and of a minimum thickness: to provide acasing lo which can be quickly and easily assembled and permanentlysecured in place around an electric coil winding; to provide improvedmeans for connecting the coil in the desired electric circuit; and ingeneral, it is the object of my invention to provide an improvedprotecting casing` for an electric coil winding.

Other objects and advantages of the invention will be understood byreference to the following specification and accompanying drawings inwhich l have illustrated an electric coil enclosed in a casing embodyinga preferred form of my invention.

- In the drawings: j

Fig. l. is an end elevation.l

Fig. 2 is a section on the line 2-2 of Fig. 1;' and Fig. 3 is a v'iewsimilar to Fig. 2 but on a smaller scale and showing the' parts of myimproved casing separated as they may appear before being assembledaround the coil.

Referring now lustrated an electric ont embodiment is a winding of asmall gauge, enamel covered, copper wire. The winding may be madein anyapproved manner and may be bound by strips of tape 6 which serve toprevent unravelling or unwinding of the coil. It will, of course,'beunderstood that the coil is wound on a mandrel or the like so that thecoil is provided with a central opening when the same is removed fromthe mandrel. The strips '6 of tape are placed on the mandrel when thewinding of the coil is started so that the coil is wound thereover andwhen the winding is completed,v free ends of the tape are broughtupwardly across the sides or ends of the winding and inwardly across theface thereof into overlapping relation substantially as shown in Fig. 2.The coil is, of

to the drawings, I have ilu coil 5, which inthe pres! course. woundbetween suitable flanges which are removably mounted on the mandrel sothat when the winding operation is completed, the flanges may be removedand the tape manipulated as above described. Preferably. the coil iswound around a layer of suitable insulation indicated at 7, which may beof paper and which is placed on the mandrel before the coil is wound.

A sleeve or tube 8 of insulating material is inserted into 'the centeropening of the coil, the tube being of such length that end portionsthereof project from the ends of the coil as indicated in broken linesin Fig. 2. The tube S in the present instance, is formed of a suitablegrade of paper, and preferably a very heavy grade of cardboard which isimpregnated with wax or a Wax-like composition which serves to stitfenthe tube.

The above described tube constitutes an inner casing or covering partsince it serves to cover the inside surface of the coil. For coveringthe ends and outer periphery of the coil, l provide a drum formed of asleeve or tubular casing 9 and end closures or caps 1() and l1. rlhecasing 9 may be in the form of a simple tubular member made of paper,cardboard or other suitable material, the length of the said casing partbeing slightly greater than the length of the coil, as shown in Fig. 2.

The cap members 10 and 11 are preferably provided with peripheralflanges 12 and 13 respectively, the said flanges being formed integralwith the tops or end closure parts proper and extending inwardly overthe adjacent ends of the coil. By preference, the flanges 12 and 13 ofthe caps tit over the outside of the tubular casing 9, as clearly shownin Figs. 2 and 3. The end closures 10 and 11 are axially apertured, asindicated at 14 and 15 in Fig. 3, to fit over the projecting ends of thetube 8.

When the casing 9 and end closures l() and 11 are assembled over thecoil 5 as above described, the projecting end portions of the tube 8 areswaged outwardly as shown at 16 and 17. so as to overlie inner marginalportions of the respective end closures 10 and 11. When the tube 8 ismade of WaX impregnated paper as above described, the swaging of theends of the tube` may be effected by means of a heated swaging diefitting inside of the tube 8 and having a properly shaped shoulder toforce the ends to the desired outwardly offset position, such asillustrated. It will, of course, be understood that the wax or othermaterial with which the tube is impregnated is such that at ordinarytemperatures, the material is in a solid state and when heated softensso that it may be molded to the desired shape. Hence, it will beunderstood that the material with which the tube is impregnated servesto cause the ends of the tube to retain their outwardly sWaged shape.

The entire coil covering may be formed of suitably moisture-proofed orotherwise treated pa er or other material or the completed casing may bedipped or otherwise coated with a suitable sealing compound, such asvarnish, shellac, paraiiin or the like, which will serve tomoisture-proof the casing and also to cement or bind the parts of thecasing permanently together.

For facilitatingv connection of the coil in an electric circuit, Iprovide conductors 18 and 19 which are electrically connected tosuitable terminals 20 and 21 respectively, to which terminals the innerand outer ends 5a and 5b respectively of the coil winding are alsoconnected. The terminals or connectors 20 and 21 are preferably of aneyelet form, as best shown in Fig. 2, the same having tubular portions22 which pro'ect through an insulating material disc 23, t e saidtubular portion being clinched over the inside of the said disc 23, asshown at 24. The disc 23 constitutes a terminal support and ispreferably formed of suitable insulating material, in the presentinstance a suitable grade of paper, the said disc being axially aper''tured to fit over the end of the tube 8 and of such an outer diameterthat it will iit inside of one end portion of the casing 9, as clearlyshown in Fig. 2. The tubular portion 22` of the terminal may, of course,be simply in the form of one or more prongs projecting through the disc23 and clinched over the inside of the support 23. Aninsulating materialannular disc 25, similar to the terminal support 23 is interposedbetween the terminal support 23 and the coil 5 to protect wires of thecoil from damage by the bent over prong portions 24 of the connector.

A portion of the covering, preferably the adjacent cap 10, is providedwith an opening 26 adjacent the periphery of the cap through whichopening the conductors 18 and 19 extend from thev inside of the casingto the outside. The casing part overlying the terminals 20 and 21 may bebulged outwardly slightly, as indicated at 27 in Fig. 2, due to thethickness of the said terminals. Such bulging is readily ermitted in thepresent instance Without injury to other parts of the casing due tothenormal flexibility of paper and also to the form of opening 26 hereinshown, which opening obviously lrelieves the end closure proper from thestiffness otherwise present because of the flange 12. The opening 26 mayconveniently be sealed against moisture or other matter by means ofsealing wax or'the like so that the 'casing will be substantiallymoisture-proof and permanently sealed.

I have herein described a coil structure which is substantiallycylindrical and I have termed the covering-a drum. It is to beunderstood that the drum may be any shape besides cylindrical,depending, of course, upon the shape of the coil which obviously may beof many shapes other than that described.

While` the above described coil is designed to meet the requirements ofone specific purpose, which is not material to the present application,Iam aware that the features of construction are well adapted to electriccoils and windings for a variety of purposes, and I am aware thatchanges may be made in the form, construction and arrangement of partswithout departing from the spirit of my invention, the scope of whichshould be determined by reference to the following claims, the samebeing construed as broadly as possible consistent with the state oftheart.

I claim as my invention:

1. In combination, an electric coil winding and a protective casingtherefor comprlsing a paper drum enclosing said wind- 1ng said drumincluding a tubular part around the outer periphery of the winding, andend closures for the opposite ends of said tubular part, said endclosures being also of paper and having integral flanges also extendingover the periphery of the winding and overlapping said tubular part.

2. In combination, an electric coil winding, a terminal support disposedatwise adjacent a part of said coil, a terminal mounted on said support,said coil being electrically connected to said terminal, a protectivecovering for said parts comprising a paper drum enclosing said parts,,said drum being provided with an opening, a conductor extending throughsaid opening and connected to said terminal inside of said drum.

3. In combination, an electric coil winding, a terminal support disposedfiatwise adjacent a part of said coil, a terminal mounted on saidsupport, said coil being electrically connected to said terminal, aprotective covering enclosingsaid parts comprising a paper drum formedof a plurality of independent parts assembled over said coil andterminal support, means for uniting said parts to maintain the same inassembled position, one of said parts being provided with an opening,and a conductor extending through said opening and connected to saidterminal inside of said easing.

4. In combination, an electric coil Wind ing, an insulating, sheetmaterial terminal support disposed flatwise adjacent a part of saidcoil, a terminal mounted on said support, an insulating 'sheet materialmember interposed between said terminal support and said ycoil part,said coil being electrically connected to said terminal, a protectivecovering for said parts comprising a paper drum formed of a plurality ofindependent parts assembled over Said coil and terminal support, meansfor uniting said parts to maintain the same in assembled position, oneof said parts being provided With an opening, and a conductor extendingthrough said opening and connected to said terminal inside of saidcasino.

5. In combination, a tube, an electric coil Winding on said tube, saidtube having end portions projecting outwardly beyond the ends of saidcoil, and protective means enclosing said coil comprising a tubularcasing fitting around the periphery of said coil, and apertured endclosures fitting over the opposite ends of said tube,"`said end closurescovering the opposite ends of said coil and being united to said easing,the projecting ends of vsaid tube being sWaged outwardly so as tooverlap inner marginal portions of said end closures, thereby tomaintain said end elo'- sures in assembled position.

G. In combination, an electric coil Winding, a terminal support disposediiatwise adjacent a part of said Winding, a terminal on said support,said coil being electrically connected to said terminal, a protectivecovering for said parts comprising a easing fitting around the peripheryof said coil and provided with end closures covering the ends of saidcoil, said covering being provided with an opening, a conductorextending through said opening and electrically connected to saidterminal inside of said covering, and means for maintaining saidcovering parts in assembled position around said Winding.

7. In combination, an electric coil Winding, a terminal support ofnon-conducting sheet material disposed flatwise adjacent a part of saidWinding. a terminal on said support,

said coil being electrically connected to said terminal, a protectivecoveringv 'for said parts comprising` a casing fitting around theperiphery of said coil and provided with end closures covering the endsof said coil. said covering being provided With an opening, a conductorextending through said opening and electrically connected to saidterminal inside of said covering, and means for maintaining saidcovering parts in assembled position around said Winding.

8. In combination, a tube, an electric coil Winding on said tube, saidtube having end portions projecting from the ends of the coil,

a terminal support disposed tiatwise adjacent a part of said coil, aterminal on said support, said coil being electrically connected to saidterminal, a protective covering for said parts comprising a casingitting around the periphery ot said coil, annular end closures for saidcasing fitting over the projecting ends of said tubular core, said coreends being swaged outwardly to overlap inner marginal portions of saidend closures to thereby maintain the same in, assembled position, and aconductor electrically connected at one end to said terminal inside ofsaid cove `ing, said covering being provided with an opening permittingsaid conductor to extend outwardly therethrough.

9. In combination, an electric coil Winding, a terminal supporting discdisposed adjacent one end of said coil, a terminal mounted on said disc,said terminal having a portion projecting through the disc and clinchedon the inside thereof` a disc of insulating material interposed betweensaid terminal supporting disc and the adjacent end of said coil forprotecting said coil from damage by said clinched terminal portion, anda protective covering for said parts comprising a tubular casing ttingaround the periphery of said coil, and end closures for the ends of saidcasing, one of said end closures being provided with an opening, and aconductor extending through said opening and connected to said terminalinside vof said casing. A

10. In combination, a tube, an electric coil Winding on said tube, thelatter having end portions projecting from the respective ends of saidcoil, an annular terminal disc fitting around said tube and disposedadjacent one end of said coil, a terminal mounted on said disc, saidterminal having a portionl extending through the disc and clinched overthe inside thereof, an annular insulating material disc interposedbetween said terminal disc and the adjacent end of said coil, aprotective covering enclosing said parts and comprising a tubular casingfitting around the periplr ery of said coil and annular end partsfitting around said projecting tube ends and united adjacent theirperipheries to said casing, said projecting core ends being sWagedoutwardly to overlap inner marginal portions of said annular endclosures to hold the same in assembled position, one of said endclosures having an opening therein, and a conductor extending throughsaid opening and electrically connected to said terminal inside of saidcasing.

ll. In combination, an electric coil Winding having a center opening, atube in said opening having end portions projecting beyond the ends ofsaid coil` a terminal supporting annular disc fitting over one of saidVtube ends and disposed flatWise adjacent one end of said Winding, aterminal eyelet electrically connected to said Winding and mounted llnon said support, said eyelet having a prong portion projecting throughand bent over the inside of the support to fasten the ter- .minalthereon, an insulating material, annular disc interposed between saidterminal support and the coil for protecting said coilfrom damage bysaid, bent over terminal prongs, a protective covering for said partscomprising a tubular casingfitting around the periphery of saidl coil,annular end closure members fitting over said tube ends and closing theends of said tubular casing, one of saidend vclosures being apertured,an electric conductor extending throughsuch aperture and connected tosaid terminal inside of said covering, the ends of said tube beingswaged outwardly to overlap inner marginal portions of said endclosures, thereby to maintain said covering parts in assembled positionaround said enclosed parts. o i

12. In combination, an electric coil winding having a center opening, apaper tube in said opening' having end portions projecting beyond theends 'of said coil, a terminal supporting annular disc fitting over one.of said tribe ends and disposed atwisefadjacent lone end of saidwinding, aterminal eyelet' electrically connected to said winding andmounted on said support, said eyelet having -a prong portion projectingthrough and bent over the inside of thesupport to .fasten the terminalthereon, an insulating material a n-.

-ble'd position, said casing being provided with an opening, and a.lconductor eirtending through said opening and connected inside of saldcasing to said termlnal.

13. In combination, an electric coil wind-l ing having a center opening,a'paper tube-in said opening having end portions projecting beyond theends of said coil, a terminal supporting annular disc fitting over oneof sa1d tube ends and disposed flatwise adjacent one end of saidwinding, a terminal eyelet electrically connected to said Winding andmounted on said support, said eyelet having a'prong portion projectingthrough and bent over the inside of the support to fasten the terminalthereon, an insulating material annular .disc

linterposed between saidterminal support and the coil for protectingsaid cil from damage by said bent over terminal prongs, a. protec tivecovering for said parts comprising a paper drum including a tubularcasing fitting around the periphery of said coil, and a pair of axiallyapertured, flanged cap members fitting overy and closing the ends ofsaid tubular j casing, the apertures in said caps fitting around saidpaper tube ends and the latter being swaged outwardly 'to overlap inner'marginal portions' ofsaid caps, thereby to l maintain said casing partsin assembled position, said casing being provided with an open-y ing, aconductor extending through said opening fand connected inside of saidcasing to said terminal, said casing being coated with a sealingcompound serving to moisture-proof the casing and also to permanentlyunite the parts thereof.

14. In combination, la pa er tube, an electric coil winding on said tue, said tube having end portions projecting outwardly beyond the ends ofsaid coil, and protectiveI means enclosing said coil comprising atubular casing fitting around the periphery of said.

coil, and apertured end closures fittlng over the opposite ends of saidtube, said end closures covering the opposite ends of said coil.;

Vand being united to said casing, the projecting ends of said tube beingswaged outwardly so asto overlap innermarginal portions of said. endclosures, thereby tomaintain said end closures in assembled position,said paper -M tube being impregnated with a normally hard, wax-likecomposition which softens when heated, said composition normally servingto cause the tube e'ds to retain their outwardly swaged sha e.

in combination, electric coil winding and a protective casing thereforformed of paper or the like, said casing comprising a substantiallycylindrical drum adjacent the inner l A10o 15. Ina device of t e classdescribed andu periphery of said winding and a similar drum L adjacentthe 'outer periphery thereof, annular'caps forthe ends'of said windinghaving cylindrical flanges overlapping sald outer drum, saidcasingforming a substantially` complete enclosure for said winding, and aplurality of binding strips of insulating material extending completely.around said coil 'winding transversely of the turns thereof.

16. In a device of the class described and in combination, an electriccoil winding and a protective casing therefor formed of paper or thelike, said casing comprising a substantially cylindrical drum adjacentthe inner periphery of said windin and a similardrum adjacent the outerperip caps for the ends of said windirg having cylindrical flangesoverlapping sai outer dru m, said casing forming a substantiallycomplete enclosure for said winding, and a sleeve of relatively stiffinsulating material disposed on the interior of said inner drum, theends of said sleeve being flanged outwardly so' as to overlap saidycaps.

ery thereof, annular` oHARLEs M wiNKELimN.

